Low [CVE-2026-84140] Site isolation issue in the DOM: Navigation component
This low-severity Red Hat Linux advisory covers CVE-2026-84140.
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Summary
Site isolation issue in the DOM: Navigation component. This vulnerability was fixed in Firefox 155, Firefox ESR 153.2, Thunderbird 155, and Thunderbird 153.2.
Red Hat Product Security rates the severity of this flaw as determined by the Mozilla Foundation Security Advisory. Red Hat severity: Low — CVSS 3.4 (CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:C/C:L/I:N/A:N).
Weakness: CWE-1100. Red Hat lists Red Hat Enterprise Linux 10; Red Hat Enterprise Linux 6; Red Hat Enterprise Linux 7; Red Hat Enterprise Linux 8; Red Hat Enterprise Linux 9 as not affected.
Affected versions
No affected-version range was extracted from the source record. The vendor advisory is authoritative — check it before change work.
Official advisory · high-confidence parse· fetched 8 days ago·verify at source
Mitigation checklist
- Update to Firefox ESR 153.2, Firefox ESR 140.15, or Firefox 155 or later. Red Hat will provide updated Firefox packages through standard update channels. Until updates are applied, users should exercise caution when visiting untrusted websites.
Official advisory · high-confidence parse· fetched 8 days ago·verify at source
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